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<h3>
Peter Wu pushed to branch master
at <a href="https://salsa.debian.org/reproducible-builds/reproducible-website">Reproducible Builds / reproducible-website</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://salsa.debian.org/reproducible-builds/reproducible-website/commit/edca63201bec79e62df5c34fc0534ecd29b9b918">edca6320</a></strong>
<div>
<span>by Peter Wu</span>
<i>at 2019-01-18T18:52:51Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">build_path: document use of -fmacro-prefix-map/-ffile-prefix-map
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<h4>1 changed file:</h4>
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<a href="#b1181475405991b26ef5dde7e1ce398e536afc34">
_docs/build_path.md
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<h4>Changes:</h4>
<li id="b1181475405991b26ef5dde7e1ce398e536afc34">
<a href="https://salsa.debian.org/reproducible-builds/reproducible-website/commit/edca63201bec79e62df5c34fc0534ecd29b9b918#b1181475405991b26ef5dde7e1ce398e536afc34"><strong>_docs/build_path.md</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -22,10 +22,20 @@ post-processing tool to</td>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="markdown">change them to a pre-determined value<span class="p">[</span><span class="nv" style="color: teal;">^debugedit</span><span class="p">]</span>. A work-around is to</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="markdown"><span class="p">[</span><span class="nv" style="color: teal;">define the build path as part of the build environment</span><span class="p">](</span><span class="sx" style="color: #d14;">{{</span> <span class="nn" style="color: #555;">"/docs/perimeter/"</span> | prepend: site.baseurl }}),</span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="markdown">however <span class="sb" style="color: #d14;">`reprotest`</span> changes it so this makes it harder to assess reproducibility.</span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="markdown">Another work-around is GCC's <span class="sb" style="color: #d14;">`-fdebug-prefix-map`</span>, though it does not</span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="markdown">fix other sources of irreproducibility such as <span class="sb" style="color: #d14;">`__FILE__`</span>, and in some</span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="markdown">packages the option itself is saved into other parts of the build</span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="markdown">output by another tool.</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="markdown">Certain compiler flags can work around the issue:</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="markdown"><span class="p"> *</span> <span class="p">[</span><span class="nv" style="color: teal;">`-fdebug-prefix-map=OLD=NEW`</span><span class="p">](</span><span class="sx" style="color: #d14;">https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html#index-fdebug-prefix-map</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="markdown">   can strip directory prefixes from debug info.</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="markdown">   (available in all GCC versions, Clang 3.8)</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="markdown"><span class="p"> *</span> <span class="p">[</span><span class="nv" style="color: teal;">`-fmacro-prefix-map=OLD=NEW`</span><span class="p">](</span><span class="sx" style="color: #d14;">https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html#index-fmacro-prefix-map</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="markdown">   is similar to <span class="sb" style="color: #d14;">`-fdebug-prefix-map`</span>, but addresses irreproducibility due to</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="markdown">   the use of <span class="sb" style="color: #d14;">`__FILE__`</span> macros and alike.</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="markdown">   (available since GCC 8, Clang support is <span class="p">[</span><span class="nv" style="color: teal;">pending</span><span class="p">](</span><span class="sx" style="color: #d14;">https://bugs.llvm.org/show_bug.cgi?id=38135</span><span class="p">)</span>)</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="markdown"><span class="p"> *</span> <span class="sb" style="color: #d14;">`-ffile-prefix-map=OLD=NEW`</span> is an alias for both <span class="sb" style="color: #d14;">`-fdebug-prefix-map`</span> and</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="markdown">   <span class="sb" style="color: #d14;">`-fmacro-prefix-map`</span>.</span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="markdown">   (available since GCC 8, Clang support is <span class="p">[</span><span class="nv" style="color: teal;">pending</span><span class="p">](</span><span class="sx" style="color: #d14;">https://bugs.llvm.org/show_bug.cgi?id=38135</span><span class="p">)</span>)</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="markdown">Note that some packages save the compile options in the build output.</span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="markdown"><span class="p">[</span><span class="ss" style="color: #990073;">^debugedit</span><span class="p">]:</span> <span class="sx" style="color: #d14;">[debugedit](https://fedoraproject.org/wiki/Releases/FeatureBuildId)</span> can replace the path used at build time by a predefined one but it does that by rewriting bytes in place. As this does not reorder the hash table of strings, the resulting bytes are still depending on the original build path.</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="markdown"></span>
</pre>
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